<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
// 数据data变了的时候
export default {
  name: 'App'
}
</script>

<style scoped lang="scss">
@mixin radius($w){
  width:$w;
  height:$w;
  border-radius:50%;
}

.demo{
  @include radius(200px);
}
</style>
